JPH0623453A - Manufacture of plate plier - Google Patents

Abstract

PURPOSE:To provide the manufacture of a plate plier in which a holding recessed and projected part is formed inside a tip end by blanking without milling, also a plate plier is punched out for which pivotary supporting holes are formed by this blanking, a work efficiency is greatly improved and which is excellent in mass productivity. CONSTITUTION:A replacing member 4 is fitted freely attachably and detachably to the prescribed place of a lower die 3 for punching; a recessed and projected edge part 5 is formed in the position where the inner edge 3' of the lower die for punching of the replacing member 4 is formed; a base stock plate 1 is loaded on this lower die 3 for punching; a punching is performed by lowering the upper die 6 for punching; the plate plier 2 is punched out, for which the holding recessed and projected part 7 is formed inside the tip end by means of the recessed and projected edge part 5 without performing cutting (milling); and many plate cutting pliers 2 are manufactured by successively feeding the base stock plate 1 and repeating this process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing plate pliers.

[0002]

2. Description of the Related Art A plate plier is a product obtained by punching a plate material, forming a concavo-convex portion on the inside of the tip, and axially attaching two bodies having a shaft attaching hole at the center.

A conventional manufacturing method will be described with reference to FIG.

First, as shown in FIG. 4A, a plate material is punched into a plate pliers shape.

As shown in FIG. 4 (b), a concavo-convex portion 7 is formed by forming an irregular edge inside the tip of the plate pliers 2 by milling.

Next, as shown in FIG. 4 (c), a shaft attachment hole 8 is formed at a position where the two concavo-convex portions 7 and 7 are accurately butted together when the two bodies are axially attached. Plate pliers 2 as shown in
The front and rear ends of the are bent so that the concavo-convex portions 7 and 7 are accurately butted after the shaft attachment, and the base end is crushed to form the grip portion 9.

[0007]

In the conventional manufacturing method, there has been a drawback that it is very troublesome and the work efficiency is not improved because the milling process has to be performed after the punching process to form the sandwiched concavo-convex portion 7. .

Further, since the gripping concavo-convex portion 7 is formed by milling, the machining of the corrugated concavo-convex portion 7 causes a dimensional deviation, and the plate pliers 2 with the corrugated concavo-convex portion 7 vary in size. .

Therefore, the shaft mounting hole 8 must be formed at a position where the clasped concavo-convex portions 7 and 7 are accurately butted together after the milling.

Therefore, after the punching process, the milling process must be performed, and the punching process must be performed again to form the shaft attaching hole 8, resulting in very poor work efficiency.

The present invention solves the above-mentioned drawbacks, and a plate having a concavo-convex concave and convex portion 7 formed on the inner side of the tip by a punching process without milling, and a shaft mounting hole 8 formed by the punching process. It is intended to provide a plate pliers manufacturing method in which pliers can be punched out, work efficiency is extremely improved, and mass productivity is excellent.

[0012]

The gist of the present invention will be described with reference to the accompanying drawings.

A plate plier 2 is manufactured by punching out a material plate 1, and a replacement member 4 is detachably fitted to a predetermined portion of a punching lower die 3 and the inner edge of the punching lower die of the replacement member 4 is detachably fitted. A concave-convex edge portion 5 is formed at a position where 3'is formed, the material plate 1 is placed on the punching lower die 3, the punching upper die 6 is lowered and punched, and a sticking uneven portion 7 is cut on the inner side of the tip. The plate pliers 2 formed by the irregular edge portions 5 are punched and manufactured without (milling), the material plates 1 are sequentially fed, and the above steps are repeated to produce a large number of plate pliers 2.
The present invention relates to a plate pliers manufacturing method, characterized in that

[0014]

The replacement member 4 of this embodiment is replaceably fitted to the punching lower die 3 and is used to sandwich the plate pliers 2 when the blank plate 1 is punched to form the plate pliers 2. It is slidably fitted from above to the position where the uneven portion 7 is formed, and is fixed to the base plate portion 11 for fixing the punching lower die 3 by the bolt 12.

The replacement member 4 has a base portion formed in a bulging shape to prevent displacement.

The upper edge of the front surface of the replacement member 4 is flush with the inner edge 3'of the lower punch die of the lower punch die 3, and an uneven edge 5 is formed on the inner edge 3'of the lower punch die. .

At the time of punching, the uneven edge portion 5 is most easily worn as compared with the other inner edge 3'of the punching lower die, but when worn, the replacement member 4 is removed to polish the uneven edge portion 5 or a new replacement member. Replace with 4.

In this embodiment, as shown in FIG. 2, two plate pliers 2 forming a set of two are punched out of a material plate 1 by two punching upper dies 6 into two punching lower dies 3 at the same time. By this punching process, the plate pliers 2 having the clamping uneven portion 7 and the shaft mounting hole 8 shown in FIG. 1 (a) are punched out, and after this punching process, the tip is cut as shown in FIG. 1 (b). The product is obtained by bending as usual, further crushing the base end portion to form the grip portion 9, and axially attaching the two bodies through the axial attachment holes 8.

The punching process of this embodiment will be described in detail with reference to FIG.

The material plate 1 is placed on the punching lower die 3 and sequentially fed while being controlled by the spacing of the pilot holes 10.

The punching upper die 6 has two parts, a part a where one plate plier 2 is punched out and a part b where the other plate pliers 2 is punched out, and a part where the shaft mounting hole 8 of one plate plier 2 is punched out in advance. c and the shaft attachment hole 8 of the other plate pliers 2
A total of four bodies are provided at the point d for punching, and the punching lower mold 3
Will be installed at a position corresponding to this.

Therefore, two punched plate pliers 2 and two shaft attachment holes 8 are formed by one-time punching and lowering of the upper molds 6, 6, 6, 6.

When this punching operation is completed, the blank 1 is sent forward, and when the punched shaft attachment holes 8 and 8 move to the punching points a and b of the predetermined plate pliers 2, the blank 1 stops and the blank again. When the upper molds 6, 6, 6, 6 are punched down, the plate pliers 2.2 having the shaft attachment holes 8 are punched.

The punching descent and the feeding operation of the material plate 1 are repeated one after another, and a large number of plate pliers 2.2 are punched out.

Conventionally, as described above, when the plate pliers 2 are punched down, the gripping concavo-convex portion 7 is not formed, and the punching concavo-convex portion 7 is formed by milling after punching to form the corrugated concavo-convex portion 7. The dimensional variation occurs at the position.
Therefore, the shaft attachment hole 8 could not be formed in the punching process of the plate pliers 2.

However, since the clasped concavo-convex portion 7 is formed by punching at a position accurately determined by the concavo-convex edge portion 5 of the replacement member 4 fitted to the punching lower die 3, the shaft attaching hole 8 is formed in advance. The plate pliers 2 can be punched out.

Incidentally, FIG. 3 is a sectional view of an essential part. In the figure, reference numeral 13 is an uneven edge engaged with the upper die 6, and 14 is a sagging on the punched lower surface of the punched plate pliers 2. The fine blanking protrusion is formed on the upper surface of the punching lower die 3 as described above.

[0028]

INDUSTRIAL APPLICABILITY As described above, the present invention is capable of producing a plate plier having a concavo-convex uneven portion formed on the inner end of the tip without performing any milling process in the punching process, and is thus excellent in mass productivity. It becomes a manufacturing method.

Moreover, the uneven edge portion for forming the sandwiched uneven portion is more easily worn than other inner edges of the punching lower die, but since this uneven edge portion is formed as the replacement member, only the replacement member is replaced. The plate pliers manufacturing method is extremely excellent in practical use because the uneven edges can be polished or can be replaced with a replacement member having a new uneven edge.

Further, since the sandwiching irregularities are formed by punching without milling, the shaft pliers can be punched at the same time, or the plate pliers can be manufactured by punching the shaft pegs punched in advance. A plate plier having a concavo-convex concavo-convex portion and a shaft-fitting hole can be manufactured by a series of punching steps, resulting in a plate plier manufacturing method with extremely improved work efficiency.

[Brief description of drawings]

FIG. 1 is a plan view of a plate plier of each process showing a manufacturing process of this embodiment.

FIG. 2 is an explanatory plan view showing a punching process of the present embodiment.

FIG. 3 is a sectional view of an essential part showing a punching process of the present embodiment.

FIG. 4 is a plan view of a plate plier of each step showing a manufacturing process of a conventional example.

[Explanation of symbols]

 1 Material Plate 2 Plate Pliers 3 Punching Lower Die 3'Punching Lower Die Inner Edge 4 Replacement Member 5 Rough Edge 6 Punching Upper Die 7 Clamping Roughness

Claims (1)

[Claims] 1. A plate plier is manufactured by punching out a material plate, and a replacement member is detachably fitted to a predetermined position of a punching die to form an inner edge of the punching die of the replacement member. Form a concave and convex edge at the position, place the material plate on this punching lower mold, lower the punching upper mold and punch it, and the sticking concave and convex part inside the tip is formed by the concave and convex edge without cutting A method for manufacturing plate pliers, characterized in that a number of plate pliers are manufactured by punching out the manufactured plate pliers and sequentially feeding the material plates.